When I transmitted last buffer in frame, I expected both TXB and TXF would be asserted but sometimes only TXB be asserted.
TxBD before Tx: Bit31(R)=1, bit27(Last in frame)=1, bit26(Tx CRC)=1, other fields=0
TxBD after Tx: Bit31(R)=0, bit27(Last in frame)=1, bit26(Tx CRC)=1, other fields=0
Why is TXF sometimes missing?
Actually it is not a big issue because tx packet always transferred normally according to the Wireshark but it is weird.
In spite of TXF deassert, MIB and following counters increased correctly.
RMON_T_PACKETS, RMON_T_BC_PKT, RMON_T_P64～RMON_T_P1024TO2047,
RMON_T_OCTETS, IEEE_T_FRAME_OK, IEEE_T_OCTETS_OK
I believe TXB is asserted when transmit completed(R=1 to 0). Was TXB also asserted when error occured?
Any help in how to trouble shoot this would be great.